form_question_rule_type_file_size.inc

<?php
require_once dirname(__FILE__).'/../../form_question_rule/form_question_rule.inc';

class Form_Question_Rule_Type_File_Size extends Form_Question_Rule
{


    function __construct($assetid=0)
    {
        parent::__construct($assetid);

    }//end constructor


    public static function getOperators()
    {
        $operators = Array(
                        '<='    => translate('core_form_rule_file_size_<='),
                        '>='    => translate('core_form_rule_file_size_>='),
                     );
        return $operators;

    }//end getOperators()


    function evaluate($answer, $rule_data, &$q_asset)
    {
        //get all data we need from either current submission or incomplete submission
        if (!empty($_FILES['q'.$q_asset->id]['size'])) {
            $filesize = $_FILES['q'.$q_asset->id]['size'];      
        }
        else {
            $extra_data = $q_asset->getExtraData();
            $temp_file = array_get_index($extra_data, 'temp_filesystem_path','');
            $filesize = (int) filesize ($temp_file);
        }
        
        $operator = array_get_index($rule_data, 'operator', '<=');

        // comparison value will be the concatenation of the value and the
        // multiplier
        $comparison = array_get_index($rule_data, 'value', '').array_get_index($rule_data, 'multiplier', '');

        
        $comparison = strtolower(trim($comparison));
        $comp_value = floatval($comparison);

        // allow users to specify abbreviated forms of file size (kB, MB, GB)
        // the conversion used is 1024 to the kByte, rather than the decimal 1000
        if ((substr($comparison,-2) == 'kb') || (substr($comparison,-1) == 'k')) {
            $comp_value *= 1024;
        } else if ((substr($comparison,-2) == 'mb') || (substr($comparison,-1) == 'm')) {
            $comp_value *= 1024 * 1024;
        } else if ((substr($comparison,-2) == 'gb') || (substr($comparison,-1) == 'g')) {
            $comp_value *= 1024 * 1024 * 1024;
        }

        $expression = "return $filesize $operator $comp_value;";
        $valid = eval($expression);

        return $valid;

    }//end evaluate()


    function ruleDescription(&$q_asset, $rule_data)
    {
        $operator = array_get_index($rule_data, 'operator', '<=');
        $comparison = array_get_index($rule_data, 'value', '').' '.array_get_index($rule_data, 'multiplier', '');

        $error_str = translate('core_form_rule_file_size_desc_'.$operator, $q_asset->attr('name'), $comparison);

        return $error_str;

    }//end ruleDescription()


}//end class
?>